Apparatus for stippling metal bolls



DSC' 14, 1.943. F. F. HlLLIx ETAL 2,337,018

APPARATUS EOE STIPPLING METAL RoLLs AND THE LIKE original Filed Aug. 14,1941 PIE. 1 f5 dispersion or pattei'n Fig. 2, showing a modication.

Patented Dec. 14, 1943 APPARATUS ron srrrPLING METAL nous Foster F.llillix. Lakewood, Ohio, and Frederic J. Leach. deceased, late of Parma,0hio, by Anna M` Leach, executrix, Lyons, N. Y., assignors to TheAmerican Steel and Wire Company of New f Jersey, a corporation of NewJersey application August 14, 1941, serial No. Y 406,933. Divided andthis application June 18,

.- 1s42.serinmo.447,577

Our invention relates to improvements in apparatus for stipple iinishingcold rolling rolls ofthe character employed for producing stippled stripor sheet-suitable forfbonderizing, enameling or varnishing-thisapplication being a division of our* pendingapplication Serial No.406,933, filed August 14, 1941.`

Itis a prime object vourl invention to provide for stipple nishing coldrolling rolls, t`o produce throughout the surfaces thereof, minutesharply deiinedi indentations and crests aording a proper tooth" toimpart .the uniform pattern thereof to the metal rolled by said rolls.

Our invention contemplates the cutting of the roll surface by thelocalized application of sharp blows or impact upon a granular abrasivesupplied to said` surface. thereby producing the desired stippling ofthe m11.

It is also an object to provide for the unifo of the granular abrasiveso as to insure the desired uniformity of the resulting stippling..

Additional objects and advantages w11l become apparent from thefollowing .description in connection with the accompanying drawing,

- wherein:

. Fig. 2 is an enlarged sectional view taken on thelineII-IIofFig.1;'and

Fig. 3 is a. fragmentary view of a portion of Referring to the drawing,the roll R to be treated in the manner and by the means of the resentinvention is initially anisiiedby grind-- ping to-a high degree ofsmoothness with the desited crown and contour. 'Ihe said roll is thenplaced in a lathe-like device. such as for example,

j the roll-grinder diagrammatically illustrated 'in' 2 Fig. 1, includinga .power driven chuck or head and a tail stock 3 mounted upon asuitablebed or means or ways 5 parallel with the roll axis, and

'dab mounted thereon we provide a carriage lmouliting and supporting thestippling device S /of our inventiomfor movement thereof in a directionniriauy of the lron'R being treated.

The stippling device S is designed and oper- 'able to apply a hardabrasive to the roll surface vby localized repeated impact in such amanner as e to form sharp well defined surface indentations andintervening crests inthe roll surface without l elongation orscratching, whereby the roll surface isemcienuyandmuormly stlppledthroughout. 65 plied granular abrasive will be driven into andA To thisend, we provide an impact nammer in the form of a free pendulum 1,pivoted at its upper end by means of a jack shaft 8 mounted in bearings9 on carriage 6, so as to swing freely toward and away from the surfaceof the roll R. An impact block I0 is secured to the lower end of thehammer in any suitable manner, said block being formed of an extremelyhard material, as for example, tungsten carbide.

'Ihe lever arm of the hammer or pendulum is designed to bring the centerportion of the block I0 into contact with the roll surface substantiallynormal thereto, so as to provide for localized contact with saidsurface. The roll contacting face of the block may be curved as shownfor substantial line contact with said roll.

A rotary impact device A is also mounted on the carriage 6 inthe planeof movement of the hammer l, including an annular divided body I Imounting an annular series of equally spaced impact rollers I2projecting from the periphery of said body. Said rollers are looselymounted on traverse pins I3 so as to relieve said pins during the impactof the rollers with the hammer 'I. 'Ihe hammer may be provided with ananvil I4 opposite the block I0 thereof for receiving the repeated blowsfrom the rollers I2. upon rotation of the impact device. i

'I'he impact device A may be rotatably mounted on the carriage i bymeans of a suitable shaft I5 mounted in bearings I6 and connected with asurface, the impact device is rotated by its motor M, and a freegranular abrasive is fed in a `thin at stream or layer to the zone ofcontact of'said block I0 and the roll sm'face. A suitable abrasive feednozzle I1 may be employed, including an.

adjustable gate I8 for releasing said abrasive in the manner stated andas indicated at I z'in Fig. 2.

Said abrasive may be fed by gravity from a suitable hopper I9.

By properly synchronizing the speed of the rovtating` impact device A,the rollers I2 thereof will strike the hammer I with uniform frequency,and upon rotating the roll R about its axis, the supsized suppliedrnnish on templated within mer 1. We have found fusedalumina to be suchmaterial, and since it is relatively inexpensive, it may be employedefliciently and economically.

Due to the fact that the metal or the blockv I is materially harder thanthe metal of the rollR, the impact forces are transmittedthrough thelabrasive to the roll surface, cutting and forming indentations andproducing intervening crests in the metal thereof, thereby' producingthe dethe roll. The resulting cold working of the metal of the roll isslight and produces an excellent tooth or roughness of the surface withthe desired uniformity. The limited contact between the block I0 and theroll surface providesa desirablelocalization of the impact so as touniformly force the individual abrasive particles into the roll surfaceduring said impact. Such localization further serves to preventloverlapping as the treatment progresses over the roll surface.

By varying the size of the abrasive, the character and degree of theresulting stippling may be varied as desired, 'and the stippling deviceof our invention may be readily. employed for la large range of saidsizes.

For the purpose of obtaining a prearranged or selectedY stipplingpattern, ourinvention contemplates the dispersion and application of theabrasive 'particles b upon the surface of a thin flat membranous carrierby the use 'of a suitable adhesive. The carrier s o charged with theabrasive is then appiied Vover 2 I Asuch as Cellophane,

applying a granular abrasive to the roll surface, impact means operableto strike repeated blows upon the abrasive while in contact with theroll lsurface and in a direction normal to the roll surface, and' meansfor traversing said means forl applying the abrasive land said impactmeans axially of the roll to progressively and uniformly treat itssurface.

2. In apparatus of the character described, the combination with meansfor supporting a metal Y roll, a swinging hammer disposed to contact theroll surface, means for applying a thin layer of a granular abrasivebetween said hammer and the roll surface, and an impact device operableto strike repeated blows upon the hammer in a. direction to'move thelatter toward the roll surface, said hammer thereby engaging theintervening abrasive and forcing the same'into the -roll surface.

3`. In apparatus of the character described, the

combination with means for supporting a metal roll, a, swinging hammerdisposed to contact the roll surface, means for supplying a thin streamof a free granular abrasive between said hammer and the roll surface,and an impact device operable to 'strike repeated blows upon thehammegin a direction to move the latter toward the roll surface,saidfhammer thereby engaging the intervening-abrasive and frclngthe-same into the roll surface, and means for rotating the roll on itssupport. l

4. In apparatus of the character described, the combination with meansfor supportinga metal roll, a swinging hammer disposed adjacent theroll, said hammer having a hardened block thereon located to contact theroll surface upon swinging movement of the hammer, means rer applying athin layer of granular abrasive between the said block and the rollsurface, and an impact device operable to strike repeated blows on saidI hammer in a direction toward the roll surface,

v.the hammer block transmitting. said impact blows the roll surface withthe abrasive in contact y therewith, as shown in `r"ig.-3,'- and theroll is-then subjected to the action of the impacthammer 1 as before.The pattern of the stippling produced in this manner is thereforedependent upon the dispersion of the abrasive on the carrier, and

hence, byproper application ofthe abrasive to said carrier, the desireduniform stippling action is insured. Enveloping the roll'with the car-.rier has the further advantage of retaining the abrasive particlesafter impact, and the carrier and abrasive maybe readily removed uponthe completion of the treatment.` y Y A,Various changes andmodifications are conclaims. v

We-claim:

1. In apparatus of the charactery described,V the combination with meansfor supporting a metal roll, means for rotating the roll, means for thescope of the Vv,following tinue the said treatment throughout said tosaid abrasive -in a direction normal to the roll surface thereby forcingthe abrasive into said surface. l

5. In apparatus of the character described, the combination withmeansfor' supportirigi' metal roll, a membranous abrasive carrierenveloping the roll surface andhaving a granular' abrasive secured tothe side thereof nextto the roll surface in prearranged pattern, impactmeans operable to strikerepeated blows upon the carrier and its abrasivein a direction normal'rto the roll surface,

and means for effecting relative movement of the roll and impact meansto progressively -conroll surface. l-

FOSTER F. HILLIX.

ANNA M. LEACH. Eecutria: of the Estate of rFrederic J. Leach.

Deceased.' Y

